sending text mails from python with text attachments

sendEmail.py

#!/usr/bin/env python3

# this is python 2 and 3 compatible
import smtplib
from email.mime.text import MIMEText
from email.mime.multipart import MIMEMultipart
import datetime
COMMASPACE = ', '

sender = 'sender@example.com'
recipients = ['userA@example.com', 'userB@example.com']
subject = 'Hello World'
body = """Hello Users,
your csv file"""

msg = MIMEMultipart()
msg['Subject'] = subject
msg['From'] = sender
msg['To'] = COMMASPACE.join(recipients)
msg.preamble = subject # for clients without multipart support

# attachment file(s)
filename = "important.csv"
with open(filename, "r") as text_file:
	attachment = MIMEText(text_file.read())
	attachment.add_header('Content-Disposition', 'attachment', filename=filename)
	msg.attach(attachment)

#body
msg.attach(MIMEText(body, 'plain'))

s = smtplib.SMTP('localhost')
s.sendmail(sender, recipients, msg.as_string())
s.quit()